518120 Bearing, swingarm. left & right

Maintaining the rear suspension on a vintage Sportster or K-model requires high-quality components, and this MCS swingarm bearing is built for the task. This unit includes both the bearing and the cup, providing a complete replacement for either the left or right side of the swingarm. It fits 1952 to early 1974 K-models and XL Sportsters. Because these bikes typically use two of these assemblies, it is often best to replace them as a pair to ensure consistent handling and smooth pivot action. This bearing set replaces OEM 47521-52 and 518120, offering a reliable solution for riders looking to eliminate play in their rear end and restore the original ride quality of their classic machine.